Wiring GFCI help

I have a 30+ year old house.
I want to add a GFCI near the kitchen sink
This is what I have to work with
From the breaker box
Red - hot breaker 1
Black - hot breaker 2
White - neutral
Both breakers share the same neutral - they are chained together through
4 outlets
Red Outlet 1 (needs GFCI)
Red Outlet 2 (needs GFCI)
Black Outlet 3 (needs nothing)
Black Outlet 4 (needs nothing)
I tried to install the GFCI in outlet 1, but since it just constantly trips.
When I isolated the white from breaker 2 and was just using breaker 1,
it was ok.
Any suggestions??

The problem is on the "Load" side of the GFI outlet. You attached the
red and neutral going to the next outlet, however the neutral is also
feeding the #3 &4 outlets. Since only the nuetral is GFI Protected,
but not the black wire, it senses a current imbalance and trips. There
are 2 ways to correct this.
1) Run a seperate neutral wire from outlet #1 to outlet #2 ( probably
hard to do if walls are closed) Or maybe easier:
2) Connect GFI on outlet #1, but nothing on Load side, and connect
another GFI on outlet #2 again with nothing on load side. This leaves
the black circuit by itself.

The load side of a GFCI is used when you want that GFCI to not only
protect that outlet, but also other outlets. The other outlets are
connected to the load side of the one GFCI.
The easiest solution to your Edison circuit problem is to just use two
GFCIs in the two outlets and NOT use the load side.

If you look on the back of a GFI outlet, the top terminals are labeled
"LINE" and the bottom terminals are labeled "LOAD".
The incoming feed goes to "LINE", then usually to feed another
circuit, you connect the outgoing feed to "LOAD". This means any
outlet downstream is protected. So if the GFI tripped, the downstream
outlets would be dead also.
However your situation is different. You have to basically install the
GFI's as stand alone outlets, not feeding other outlets.
But continue feeding the other outlets by just wire nutting in the box.

re: Why would you ever ever want downstream outlets dead too?
I have 3 receptacles in my garage. The "first" is a GFCI, the other 2
are on the load side.
I can use any (or all) receptacle and have protection at each one.
In my basement bathroom, I have a light fixture over the shower stall.
It is on the load side of the GFCI, just in case...

Yes I believe it is.
What I meant was just to show another reason for using the load side of
the GFCI. The "just in case" was the reason - just in case someone comes
in contact with the fixture (and it's hot, etc.)

As Mikepier suggested, don't connect anything to the load side of any GFCI.
You have an Edison circuit, which makes things a little more complicated.
Wherever you want a GFCI outlet, remove the existing outlet, splice the
neutral wires together with a pigtail to the GFCI and if there is more than
one hot wire on the existing outlet, splice them together also with a
pigtail to the new GFCI

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